Vladimir N. Chernenkov

THE CATS SERVICE: AN ASTROPHYSICAL RESEARCH TOOL

We describe the current status of CATS (astrophysical CATalogs Support system), a publicly accessible tool maintained at Special Astrophysical Observatory of the Russian Academy of Sciences (SAO RAS) (http://cats.sao.ru) allowing one to search hundreds of catalogs of astronomical objects discovered all along the electromagnetic spectrum. Our emphasis is mainly on catalogs of radio continuum sources observed from 10 MHz to 245 GHz, and secondly on catalogs of objects such as radio and active stars, X-ray binaries, planetary nebulae, HII regions, supernova remnants, pulsars, nearby and radio galaxies, AGN and quasars. CATS also includes the catalogs from the largest extragalactic surveys with non-radio waves. In 2008 CATS comprised a total of about 109 records from over 400 catalogs in the radio, IR, optical and X-ray windows, including most source catalogs deriving from observations with the Russian radio telescope RATAN-600. CATS offers several search tools through different ways of access, e.g. via Web-interface and e-mail. Since its creation in 1997 CATS has managed about 105requests. Currently CATS is used by external users about 1500 times per day and since its opening to the public in 1997 has received about 4000 requests for its selection and matching tasks.

System to Estimate Ages and Redshifts for Radio Galaxies

The system allowing a user to operate with simulated curves of spectral energy distribution (SED) and to estimate ages and redshifts by photometric data at server {\bf this http URL} is described.

The Project of Distributed Information System OASIS

The SAO archive of observations keeps the raw observational and calibration da ta collected with various acquisition systems. A server running Oracle and web-based technology are expected to be used for distribution of the archive data.

Discovery of the Small Scale Sky Anisotropy at 2.7cm: Radio Sources or Relic Emission?

We present new limits on the small scale 3K emission anisotropy. At the scales of 1° ÷ 3.°3 all 7 harmonics have at λ = 7.6cm amplitudes below 10-5 in ΔT/T. At l from 6.1 103 to 17.5 103 (rad -1) scale this limit is about 2.8 10-4 at a wavelength of 2.7cm and may be fully explained by a discrete source contribution.The low baryonic content of the Universe and present limit on ΔT/T at the horizon scale suggest that (ΔM/M)gravitating ≪ (ΔM/M)baryonic. We speculate that 3K anisotropy measurements demonstrate a) the existence of the dark matter, b) the nonbaryonic nature of this dark matter and c) that the spatial distribution of this matter is much more homogeneous than that of the visible one.